Photos: Dinosaurs and Their Ancestors

New research says dinosaurs shared Earth for millions of years with ancestors.

Dinosaurs, Ancestors Share the Land

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The new evidence disproves the idea that dinosaurs rapidly replaced their predecessors. This image is of the two carnivorous dinosaurs and two dinosaur ancestors were discovered at Ghost Ranch, N.M., by scientists at U.C. Berkeley and the American Museum of Natural History. (UC Berkeley)
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